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2020

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White corundum grinding powder manufacturing process impurities determine the service life


White corundum raw material for grinding wheel factory furnace core material or bulk material A1203 crystal, the content is greater than 98.5, its particle size is 36#,46#,100#, the content of Si02 in the raw materials used should be as little as possible, in order to prepare white corundum grinding powder, its manufacturing process is as follows:

1. The equipment used includes ball mill (150x 300,260x 300,350x 500), glass cylinder (300x 500), high temperature electric furnace, oven, washing tank and ventilation box, etc.

2, its manufacturing process is briefly described as follows:

a. Crushing

Put the quenched poem ball copper raw materials with different diameters into the drum, add water, put a rubber pad to seal the cover, then rotate the drum, and crush the abrasive under the stroke of the poem ball.

B, acid washing and water washing

The purpose is to wash away iron impurities in the abrasive.

C. Sorting

The water separation method is used for sorting in the glass cylinder.

d. Drying

Heat up 10(T20(TC drying, after drying, grind the agglomerates with glass grinding rod or horn spoon.

e. Calcination

Put the white corundum grinding powder into the electric furnace or muffle furnace, from room temperature to 850 degrees, sometimes up to 1200 degrees for W0.5-w1 grinding powder, and then keep the temperature for 5 hours.

f. Soaking

Abrasives used in sand-embedded grinding and fine polishing need to be treated. Soaking requirements are: 0.4g stearic acid plus 20g grinding powder plus 200 ml aviation gasoline, put into a grinding glass bottle to soak for more than seven days.

The impurity of white corundum determines its service life, and the quality of white corundum will affect its effect. White corundum in the production process will contain impurities, the main impurities are SiO2, Fe2O3, TiO2, the less impurities, the higher the quality of white corundum. The content of AL2O3 in white corundum also directly indicates the quality of white corundum. The impurities of white corundum determine its service life. Here is a specific explanation for you:

White corundum can also be used as a refractory material, if it contains impurities will affect its fire resistance. Some of the impurities in the refractory material are fusible, and some have a high melting point, but when the same main component coexists, it can produce fusible. Therefore, the presence of impurities often has a strong fluxing effect on the main component. Although the fluxing effect sometimes contributes to the liquid phase sintering of the material, it is seriously harmful to the resistance of the material to high temperature. White corundum is mainly used as an abrasive. In recent years, it has been widely used in refractory materials, such as iron hook castable, no blisters, steel jade bricks, prefabricated parts, permeable bricks, ladle bricks, magnesium aluminum carbon bricks, etc.

White corundum used in refractory materials generally used to do aggregate and fine powder, its advantages are high refractoriness, wear resistance, erosion resistance, high volume density, high alumina content, mainly used for high aluminum and alumina system. Products also have high load softening temperature and high temperature volume stability. The impurities of white corundum determine the life of the product during use. Since impurities have not been removed during smelting, white corundum also contains calcium hexaaluminate, calcium plagioclase, spinel, rutile and other secondary crystal phases and glass phases, iron alloys and solid solutions.


RELATED INFORMATION

Fused white corundum, dense corundum (tabular corundum), brown corundum. These three are all aluminum raw materials. Fused white corundum is calcined alumina or industrial alumina as raw material, high temperature melting in the electric arc furnace, white, block material, crystal for the strip and rhombus, and often the skeleton of the crystal. Because the raw material is very pure, no chemical reaction occurs in the electric furnace operation, but the temperature of the molten liquid, the cooling rate, etc. have a great influence on the structure of the block. Fused white corundum, dense corundum (tabular corundum), brown corundum. These three are all aluminum raw materials. Aluminum content Dense corundum and white corundum reached 99%, brown corundum aluminum content: 95%. Price, dense corundum higher than white corundum White corundum is higher than brown corundum. So in the application of refractory materials, dense corundum is better than white corundum, brown corundum ranked third
Magnesium aluminate spinel is widely used in steel-making refractories due to its special properties of slag corrosion resistance, good thermal shock resistance and high strength at high temperature. High quality pre-fit The preparation of spinel provides a new raw material for the production of amorphous and shaped high purity refractories. The two main methods for the synthesis of spinel are sintering and electrofusion. Most spinel materials are made from high-purity synthetic alumina and chemical grade magnesia, That is, sintering in a shaft kiln and electromelting in an electric arc furnace. The advantage of sintering magnesium aluminate spinel is that the process is a continuous ceramization process, controlling the feed in the kiln. Velocity and uniform temperature distribution, resulting in a very uniform crystal size of 30-80 μm and low porosity (<3%) of the product. Electromelting production of magnesium aluminum spinel is a representative intermittent operation, large casting blocks need to extend the cooling time, the cooling of the casting block leads to microstructure. Uneven, due to faster cooling, the outer spinel crystals are smaller than the inner ones, and the low melting point impurities are concentrated in the center. Therefore, it is necessary Spinel raw materials are sorted and homogenized. Another advantage of using high-purity raw materials to produce aluminum magnesium spinel is the low impurity content in the aluminum magnesium spinel aggregate (MgO A1203>99%), especially SiO2 The low content makes it have good high temperature performance. Alumina-based aluminum magnesium spinel has no good performance as synthetic alumina-based aluminum magnesium spinel and can only be used Corrosion resistance and high temperature strength requirements are not high parts.
Magnesium aluminate spinel has excellent properties, such as high melting point (2135), high hardness (16GPa), low thermal expansion, high corrosion resistance and excellent optical properties. Widely used in refractory materials, humidity sensors, transparent ceramic materials, anode materials, artificial flange materials and catalytic materials.
Bauxite-based sintered magnesium aluminate spinel uses high-quality bauxite with Al2O3 content of more than 76% and high-quality light burned magnesium powder with MgO content of more than 95%. In an ultra-high temperature tunnel kiln, it is sintered at a high temperature above 1800°C. Bauxite-based sintered magnesium aluminate spinel uses high-quality bauxite with Al2O3 content of more than 76% and high-quality light burned magnesium powder with MgO content of more than 95%. The chemical process is sintered at a high temperature above 1800°C in an ultra-high temperature tunnel kiln, with high volume density, high mineral phase content, good grain development and structure. Uniform, stable quality. Magnesium aluminate spinel has good corrosion resistance, corrosion, peeling ability, good slag resistance, abrasion resistance, thermal shock stability Good, high temperature resistance and other performance characteristics. It is the production of refractory products such as magnesium aluminum spinel bricks, ladle lining bricks, ladle castables and other refractory products for the high-temperature zone of cement rotary kilns. Ideal raw materials. Magnesium aluminate spinel is widely used in refractory materials, iron and steel smelting, cement rotary kiln and glass industrial kiln It has good erosion resistance, abrasion resistance and good thermal shock stability. Its main purpose: one is to replace the magnesium chrome sand manufacturing magnesium aluminum spinel brick Used in cement rotary kiln, not only to avoid chromium pollution, but also has good resistance to spalling; the second is used to make ladle castable, greatly improving the steel plate Lining resistance to erosion. It is widely used in steel-making refractory materials. Preparation of high-quality pre-synthesized spinel for amorphous and shaped high-purity refractories The production of new raw materials